# Efficiency Puzzle — Data Summary

## Variables constructed

| Variable | Definition | N obs |
|:---------|:-----------|:------|
| rd_efficiency | log(patents_per_million / rd_expenditure_gdp) | 738 |
| health_rd_proxy | health_exp_gdp × rd_expenditure_gdp | 735 |
| log_gdp_pc | log(gdp_pc_ppp) | 6553 |
| manufacturing_va_share | WDI NV.IND.MANF.ZS | 5992 |
| researchers_per_million | WDI SP.POP.SCIE.RD.P6 | 1887 |
| patents_per_researcher | patents_per_million / researchers_per_million | 582 |
